#header {
    height: 60px;
    line-height: 60px;
    background-color: #444;
    color: #fff;
}

#header header{
    width: 800px;
    margin: 0 auto;
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 26px;
    font-weight: bold;
}

#header header input {
    width:300px;
    height: 40px;
    border: none;
    background-color: #fff;
    color: #999;
    border-radius: 6px;
    padding-left: 15px;
}